Adjustable bracket



l 6 I I5" w A l? 4 v I 3nventor I 2g 50 '4 William H Y/@odward I l2' BgSept 26, 1944- w. H. wovoDwARD I 2,358,844

ADJUSTABLE BRACKET Filed March 26, 1943 |7 27 z8 2,6 '5 6 affomegPatented Sept. 26,1944 4 UNITED STATES PATENT FFICE y I Y Av.22,358,8444 ADJUSTABLE BRIACKET William n. Woodward, Detroit, Mich.

Application Maren ze, 194s, serial No. 480,713

sloiams'. v (ol. 248-121) socket member swivelly receiving such postfrom relative rotative disturbance and for avoiding relative shifting ofsaid parts axially thereof.

Another object is to employ a spring mounted i on a socket member toimpose a frictional restraint on a post swiveled in such member, there`by maintaining a desired swivel adjustment of the post and socketmembenland to further annularlyA groove the post for engagement by thespring, thus preventing relative shifting of the post and socket memberalong their common axis.

These and various other objects are attained by the constructionhereinafter described and illustrated in the accompanying drawing,wherein:

Fig. 1 is a side elevational view of the improved adjustable bracket.

Fig. 2' is an elevational view of a portion of the reverse side of saidbracket.

Fig. 3 is a cross sectional view taken on the line 3-3 of Fig. 2.

Fig. 4 is a sectional detail taken on the line 4 4 of Fig. 2 to showengagement of a spring and post.

In these views, the reference character I designates a supporting basefor the bracket, one end of said base having an annular flange' 2attachable to any desired face by screws 3. The other end of said basehas a spherical enlargement 4 formed with two transverse bores 5 ineither of which a post B may be rigidly held in selective positions ofsliding adjustment by a set screw 1.

Swiveled on said post is one end of a cast arm 8 extending approximatelytransversely to the post, said end forming a sleeve. type socket 9 toreceive the post. Secured by a set screw I0 in a sleeve type socket Ilformed on the other end 0f said arm is a relatively short post I2whereon is swiveled a sleeve type socket I3 integrally carrying acircular friction plate I4. Bearing on and mated with the plate I4 is asimilar plate I5, the two plates being interconnected by a bolt I6,Whchlwith its nut I1 regulates the pressure mutually applied by saidplates. A sleeve type socket I8 integrally formed on the plate I5receives one end of a tubular arm I9, fastened in the socket by a setscrew 20.

To the other end ofthe arm I9 is swivelly connected a shorter tubulararm 2| serving to mount a lamp socket 22 or any other element requiringconsiderable universal adjustment. trated connection between the arms I9and 2| is established by sleeve type socket members 23 respectivelyreceiving said arms and integrally formed with friction lugs 24interconnected under selective pressure by a screw 25 and a suitable nut(not shown).

The present invention lies particularly in a means associated with thesocket members 9 and I3 to yieldably resist swivelling thereof on theposts, and to further prevent axial shifting of said socket members.Thus each socket member 9 and I3 is slotted as indicated at 26 to permita rectangular sheet metal spring 21 to be stressed against thecorresponding post, said springs being clamped, under regulablepressure, by screws 28, respectively to the arm 8 and to a lug 29radially projecting from the socket member I3. As best appears in Fig.3, the springs 21 are bridged between their ends, each bearing at oneend on the corresponding post and their opposite ends respectivelybearing on the arm 8 and lug 29, the screws 28 engaging said springsbetween their ends. Preferably the springs are bowed slightly, thescrew-applied stresses tending to reduce curvature.

Heretofore it has been necessary to use set screws, cotter pins, setcollars and the like to prevent relative axial shifting of a post andsocket member receiving such post. In the disclosed construction, thesprings 21 are made to positively resist any such axial shifting byforming the posts with annular grooves 30 receiving the springs, one ofsuch grooves being shown in Fig. 4.

This simplifies both construction and assembly, while improving"appearance of the bracket.

Ihe described bracket is applicable to many purposes, and isparticularly suited to carry a lamp for illuminating rmaclnebperations.Considerable adjustability is especially necessary for a. lamp bracketused on machine tools to suit varying positions of the work and workingmembers, and it is Vhighly important to avoid accidental loosening ofthe bracket connections since this might perrrnit some'portion of thebracket to be struck 'by a moving part o f a machine. The improvedmanner in which the springs 21 restrain sliding movement of the socketmembers on the posts is of so positive a nature as to be especially Theillusdesirable in a bracket closely associated with machinery.

When it is desired to apply an especially heavy restraint to either orboth posts 6 and l2, two or more of the springs 21 may be superposed oneon another to build up stiffness. For installations using quite longarms I9 or 2|, such heavy restraint may be necessary.

What I claim is:

1. In an adjustable bracket, a post having an annular groove, a socketmember swivelly mounted on the post and slotted to give access to saidgroove, a spring extending through the slot of the socket member intosaid groove and stressed against the post to yieldalbly resist relativerotation of the socket member and post, and a supe port for the springcarried by the socket member said spring having opposed edges coactingwith the opposed annular walls of the groove and thus positivelyrestraining the socket member and post from relative longitudinalsliding.

2. In an adjustable bracket, as set forth in claim 1, said spring havingopposite ends respectively seated against the post and said support, andbeing bridged between such ends, means engaging the spring between saidends for securing the spring to the said support and regulating thestress of the spring.

3. In an adjustable bracket as set forth in claim 1, a common means forsecuring the spring to said support and regulating the stress of thespring.

4. In an adjustable bracket as set forth in claim 1, said support forthe spring rigidly and laterally projecting from the socket member inproximity to said slot.

5. In an adjustable bracket as set forth in claim 1, said support forthe spring rigidly and laterally projecting from the socket member, thespring being elongated transversely to the post and being curved fromend to end, means engaging the spring between its ends securing the 20spring to said support and applyinga stress to the

